.nav-top{
    z-index: 1;
    position: relative;
    left: 20px;
    top: 10px;
    color: #f4f4f4;
    height: 80px;
    line-height: 80px;  /*height和line-height一样即可让其只有一行*/
    background: url("../img/backgroun3.jpg") no-repeat;
    background-size: cover;
}

.nav-top-1{
    z-index: 1;
    position: relative;
    color: #f4f4f4;
    height: 80px;
    line-height: 80px;  /*height和line-height一样即可让其只有一行*/
    background: url("../img/backgroun3.jpg") no-repeat;
    background-size: cover;
    display: flex;
    justify-content: space-around;
    flex-wrap: nowrap;
}

.nav-top .nav_logo{
    z-index: 1;
    float: left;
    font-size: 40px;
    position: relative;
    left: 20px;
    right: 40px;
}

.nav-top-1 .nav_logo{
    z-index: 1;
    display: flex;
    flex-direction: row;
    font-size: 40px;
    position: relative;
    left: 20px;
    right: 40px;
}

.nav-top-1 .nav_search{
    z-index: 1;
    position: relative;
}

.nav-top .nav_link{
    z-index: 1;
    float: right;
    position: relative;
    right: 50px;
}

.nav-top-1 .nav_link{
    z-index: 1;
    position: relative;
    font-size: 5px;
    display: flex;

    flex-wrap: nowrap;
    flex-direction: row-reverse;
}

.nav-top .nav_link .nav-top-item{
    z-index: 1;
    font-size: 17px;
    position: relative;
    margin-left: 20px;
}

.nav-top-1 .nav_link .nav-top-item{
    z-index: 1;
    font-size: 17px;
    position: relative;
    margin-left: 20px;
}

.search_input{
    z-index: 1;
    border-style: solid;
    border-radius: 15px;
    height: 30px;
    width: 400px;
    padding: 0 10px 0 35px;
    background-image: url(../img/search.png);
    background-repeat: no-repeat;
    background-position: 5px 1px;
    background-size: contain;
}


#search{
    margin-bottom: 0;
}
